<nav class="navbar navbar-default">
    <div class="container-fluid">
        <div class="navbar-header"><a class="navbar-brand" href="index.html">BestClass</a></div>
        <div class="navbar-collapse collapse">
            <ul class="nav navbar-nav">
                <li><a href="index.html">课堂</a></li>
                <li><a href="#">私信</a></li>
                <li><a href="#">文库</a></li>
            </ul>
            <ul class="nav navbar-nav navbar-right">
                <li class="dropdown">
                    <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false"> <span id="name"></span> <span class="caret"></span></a>
                    <ul class="dropdown-menu">
                        <li>
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                            <a href="./login.html" id="signOut">注销</a>
                        </li>
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                </li>
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</nav>
